155136461 has 4 divisors (see below), whose sum is σ = 157261692. Its totient is φ = 153011232.

The previous prime is 155136451. The next prime is 155136467. The reversal of 155136461 is 164631551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 164631551 = 7 ⋅23518793.

It can be written as a sum of positive squares in 2 ways, for example, as 103022500 + 52113961 = 10150^2 + 7219^2 .

It is a cyclic number.

It is not a de Polignac number, because 155136461 - 2²² = 150942157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155136467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062506 + ... + 1062651.

It is an arithmetic number, because the mean of its divisors is an integer number (39315423).

Almost surely, 2^155136461 is an apocalyptic number.

It is an amenable number.

155136461 is a deficient number, since it is larger than the sum of its proper divisors (2125231).

155136461 is an equidigital number, since it uses as much as digits as its factorization.

155136461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125230.

The product of its digits is 10800, while the sum is 32.

The square root of 155136461 is about 12455.3787979330. The cubic root of 155136461 is about 537.3261291597.

The spelling of 155136461 in words is "one hundred fifty-five million, one hundred thirty-six thousand, four hundred sixty-one".